Letsdatascience Claude Code MCP Traffic Hijacked to Steal OAuth Tokens
Article Content
- •Hackers exploit Claude Code MCP traffic to hijack OAuth tokens.
- •The attack allows unauthorized access to major SaaS platforms like Jira and GitHub.
- •No patch has been released by Anthropic to address this vulnerability.
A new man-in-the-middle (MitM) attack has been identified, targeting Anthropic's Claude Code ecosystem. Threat actors exploit vulnerabilities in the Model Context Protocol (MCP) traffic to intercept OAuth authentication tokens. This attack allows unauthorized access to enterprise SaaS platforms such as Jira, Confluence, and GitHub. Researchers from Mitiga Labs have detailed a five-step attack chain that redirects MCP traffic through attacker-controlled infrastructure. The attack leverages weak protections in the local Claude Code configuration file, specifically ~/.claude.json. As of now, no patch has been released by Anthropic to mitigate this vulnerability. Organizations using Claude Code are at risk of unauthorized access and data breaches. The attack is significant due to the potential for broad access to sensitive enterprise data.
Ask AI about this cluster
Answers cite the sources they use
Timeline
More articles in this cluster (3)
Following this threat?
Track Anthropic in your own feed — you're alerted when they show up in new reporting, leak sites or exploitation.
Free account · no card needed
Continue Reading
Critical BeyondTrust 9.3 Vulnerability Actively Exploited by Threat Actor A critical vulnerability (CVE-2026-102764) in BeyondTrust Remote Support has been discovered and is actively being exploited by the threat group ARMORY CASTLE, reportedly linked to China. The vulnerability, which has a CVSS score of 9.3, allows unauthenticated attackers to upload files and potentially compromise host… 
Lazarus APT Launches Operation FlashHole Using AI and Post-Quantum Cryptography Kaspersky has identified a cyberespionage campaign, dubbed Operation FlashHole, attributed to the Lazarus APT group, active since July 2025. The campaign has targeted at least three organizations in South Korea's construction, software, and wire-communication sectors. Attack methods include spear-phishing emails…